Abstract. Atmospheric methane (CH4) concentrations have been rising since 2007 due to an imbalance between CH4 sources and sinks. The budget is generally estimated through top-down approaches using chemistry transport models (CTMs) observations as constraints. atmospheric isotopic composition, δ13C(CH4), can also provide additional constraints helps discriminate emission categories. Nevertheles...

With the difference in photosynthesis process between C3- and C4-plants, 13C/12C stable isotope ratio of ethanol, i.e., δ13C-ethanol, can potentially be a basis for discrimination Scotch whiskies derived from different raw materials. This study analyzed 51 authentic single malt 34 blended by gas chromatography–combustion–isotope mass spectrometry (GC-C-IRMS) examined resulting data series fitti...

Con la finalidad de estudiar las variaciones ambientales a nivel espacio-temporal en lagunas costeras tropicales y su impacto fauna residente, se analizó composición isotópica (δ18O δ13C) 70 otolitos (1 por par) pertenecientes al pez Bairdiella chrysoura, considerada especie residente del Área Protección Flora Fauna Laguna Términos (APFFLT). Se realizaron muestreos mensuales (septiembre 2016 ag...

Objectives By focusing on two Danish leprosaria (Næstved and Odense; 13th–16th c. CE) using diet origin as proxies, we follow a multi-isotopic approach to reconstruct life histories of patients investigate how leprosy affected both institutionalized individuals the medieval community whole. Materials Methods We combine archaeology, historical sources, biological anthropology, isotopic analyses ...

Rationale Stable isotope analysis of leaf material has many applications including assessment plant water-use efficiency and palaeoclimatology. To facilitate interpretations small shifts in the carbon composition (δ13C) leaves, accurate repeatable results are required. Pre-sample homogenisation is essential to ensure a representative sample analysed, but can also introduce error. Methods We inv...

In the present work, quantification of lipids and carbon isotopic ratio (δ13C) diet, rumen, liver meat cows fed on different diets (based either C3 or C4 plants) are provided. The δ13C four compartments had trends in two diets, which could give information about fractionation processes factors influencing metabolic path regimes. resulted to be statistically for groups C4, can therefore a suitab...

Stable carbon isotope composition (δ13C) recorded in trees responds sensitively to the changing environmental conditions and thus provides a powerful tool for paleoenvironmental reconstructions. The retrospective interpretation of tree δ13C signal depends on comprehensive understanding how physiological signals are during photosynthesis is modified after photosynthesis. This thesis aims improve...